Advanced JavaScript Tutorial in Hindi [Part 94] - JavaScript Callback Function

Опубликовано: 10 Февраль 2022
на канале: Tech Gun

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Link for Complete JavaScript Tutorial in Hindi for Beginners:    • JavaScript Tutorial in Hindi

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In this video i will talk about JavaScript callback function.

A function is a block of code that performs a certain task when called.

A callback function is a function passed into another function as an argument, which is then invoked inside the outer function to complete some kind of routine or action.

Why do we need Callback Functions?

JavaScript runs code sequentially in top-down order. However, there are some cases that code runs (or must run) after something else happens and also not sequentially. This is called asynchronous programming.

Callbacks make sure that a function is not going to run before a task is completed but will run right after the task has completed. It helps us develop asynchronous JavaScript code and keeps us safe from problems and errors.

In JavaScript, the way to create a callback function is to pass it as a parameter to another function, and then to call it back right after something has happened or some task is completed. Let’s see how…

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